Definition of fairy ring
1
: a ring of basidiomycetous mushrooms produced at the periphery of a body of mycelium which has grown outward from an initial growth point
also
: a ring of luxuriant vegetation especially when associated with these mushrooms
2
: a mushroom (especially Marasmius oreades) that commonly grows in fairy rings
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Merriam-Webster unabridged
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Time Traveler for fairy ring
The first known use of fairy ring was in 1870
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